I did another 4 flights today and experimented a little with props. So far I've tried the APC 17X8, 18X8 and Zinger Pro series 18X8. IMO the best overall performance was w/ the APC 18X8. Excellent vertical and the quietest prop of the three I've tried so far. I would love to also try an APC 16X10, but there is no way to get it on because (even the short-shaft adaptor) the prop hub is just too thick for the Moki's short crankshaft.

The engine is comming along nicely and I only had a flame-out on final on the very first flight day before yesterday (no damage). I've since adjusted the idle mixture disk to lean it out a bit and have had no probs since. It will hover with the stick about 3/4 forward w/ the APC 18X8, by the way.